Deployment cucm and IP phones over wan

[akram.root]

Hello all,

I need to deploy cucm cluster ( publisher , and subscriber ) over wan , and IP phones on different brach .

In a headquarter we have call processing CUCM publisher , Cisco unity connection, IM and presence , Expressway C and E, Cisco meeting server , TMS , CUAC , 100 IPhones , and one cisco room kit for videoconference

In a site backup we have , call processing CUCM subscriber, and Expressway C and E , 50 IP phones , and one cisco room kit for videoconference.

and we have also 8 branch sites ,over wan , each site we have 20 IP Phones , and one cisco room kit for videoconference.

My question is what is your recomondation to deploy this scenario ?

How much i need of the bandwith for every site , to have a good quality ?

Best regards

Akram

[Nithin Eluvathingal]

The best document to go through before the deployment is  SRND.

https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/srnd/collab12/collab12.html

The below is from CIPTV1 Press book.

https://www.ciscopress.com/articles/article.asp?p=2743756&seqNum=6

Design Guidelines for Clustering over WAN Deployment Model

Although the distributed single-cluster call-processing model offers some significant advantages, it must adhere to these strict design guidelines:

• Two CUCM servers in a cluster must have a maximum round-trip delay of 80 ms between them. Because of this strict guideline, this design can be used only between closely connected, high-speed locations.

• A minimum of 1.544 Mbps (T1) of bandwidth is required for Intra-Cluster Communication Signaling (ICCS) between each site and every other site that is clustered over the WAN. This bandwidth supports up to 10,000 busy hour call attempts (BHCAs) within the cluster. The BHCA represents the number of call attempts that are made during the busiest hour of the day.

• In addition to the bandwidth required for ICCS traffic, a minimum of 1.544 Mbps (T1) of bandwidth is required for database and other inter-server traffic between the publisher and every subscriber node within the cluster.

• Up to eight small sites are supported using the remote failover deployment model. Remote failover allows you to deploy one server per location. (A maximum of eight call-processing servers are supported in a cluster.) If CUCM fails, IP phones register to another server over the WAN. Therefore, Cisco Unified SRST is not required in this deployment model (although it is supported). The remote failover design may require significant additional bandwidth, depending on the number of telephones at each location

You can also go through the port usage document if any firewall come's in between.

https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/12_0_1/systemConfig/cucm_b_system-configuration-guide-1201/cucm_b_system-configuration-guide-1201_chapter_01010110.html

[akram.root]

Thank you for your informations  , but i would know how much of bandwidth consumes a phone call at a remote site over wan ? 

Thanks in advance .

Best regards 

[Roger Kallberg]

That would be dependent on what codec you use for your calls. There is a bandwidth calculation tool on cisco.com. Recommend you to use that to get the answer on your questions.

[Nithin Eluvathingal]

As @Roger Kallberg mentioned it purely depend on the codec which u use.

you can go through below link to learn more about the Voice Over IP - Per Call Bandwidth Consumption

https://www.cisco.com/c/en/us/support/docs/voice/voice-quality/7934-bwidth-consume.html

you can access Voice Codec Bandwidth Calculator from below link.

https://cway.cisco.com/vc-calculator/